The Zeeman splitting of the metastable 5 ${\mathit{D}}_{3/2}$ level of $^{138}\mathrm{Ba}^{+}$ in a magnetic field of 6 T has been measured in a laser-microwave double resonance experiment in a Penning ion trap. The magnetic field at the ion's position is determined by the cyclotron frequency of electrons stored in the same trap. From the ratio of both transition frequencies we obtain a ${\mathit{g}}_{\mathit{J}}$ value of 0.799 327 8(3). As a by-product, we confirmed earlier measurements on the 6 ${\mathit{S}}_{1/2}$ ground-state ${\mathit{g}}_{\mathit{J}}$ factor to 2.002 492 2(10). The precision in both experiments is sufficient to test relativistic many-body calculations. \textcopyright{} 1996 The American Physical Society.The Zeeman splitting of the metastable 5${\mathit{D}}_{3/2}$ level of $^{138}\mathrm{Ba}^{+}$ in a magnetic field of 6 T has been measured in a laser-microwave double resonance experiment in a Penning ion trap. The magnetic field at the ion's position is determined by the cyclotron frequency of electrons stored in the same trap. From the ratio of both transition frequencies we obtain a ${\mathit{g}}_{\mathit{J}}$ value of 0.799 327 8(3). As a by-product, we confirmed earlier measurements on the 6${\mathit{S}}_{1/2}$ ground-state ${\mathit{g}}_{\mathit{J}}$ factor to 2.002 492 2(10). The precision in both experiments is sufficient to test relativistic many-body calculations. \textcopyright{} 1996 The American Physical Society.

Physical Review AAug 1, 199623 citations

Adiabatic cooling of ions in the penning trap

Guo Zhong Li, R. Poggiani, G. Testera +1 more

Zeitschrift für Physik D Atoms Molecules and ClustersMar 1, 199113 citations

Axialisation, cooling and quenching of $\mathsf{Ba^+}$ ions in a Penning trapAxialisation, cooling and quenching of $\mathsf{Ba^+}$ ions in a Penning trap

C. Lichtenberg, G. K. L. Marx, Giovanni Tommaseo +2 more

The European Physical Journal DMay 1, 19989 citations

The Zeeman splitting of the metastable 5

{\mathit{D}}_{3/2}

level of

^{138}\mathrm{Ba}^{+}

in a magnetic field of 6 T has been measured in a laser-microwave double resonance experiment in a Penning ion trap. The magnetic field at the ion's position is determined by the cyclotron frequency of electrons stored in the same trap. From the ratio of both transition frequencies we obtain a

{\mathit{g}}_{\mathit{J}}

value of 0.799 327 8(3). As a by-product, we confirmed earlier measurements on the 6

{\mathit{S}}_{1/2}

ground-state

{\mathit{g}}_{\mathit{J}}

factor to 2.002 492 2(10). The precision in both experiments is sufficient to test relativistic many-body calculations. \textcopyright{} 1996 The American Physical Society.

Axialisation, cooling and quenching of

\mathsf{Ba^+}

ions in a Penning trap